You'd be surprised at how stable the fishing yaks are Mark but there's no doubt they're better suited to calm seas and windless days.You've got to pick your locations according to the weather and if you're venturing any distance from shore you would really need to use a proper sea kayak.Would like to stress that anyone thinking of taking up kayak angling would really be best to take a BCU or RYA safety course so that they know exactly what they're getting themselves into.